package hadoop;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;


public class WordcountMapper extends Mapper<LongWritable,Text, Text, IntWritable> {

    // 设置 map输出的 类型
    Text k = new Text();
    IntWritable v = new IntWritable(1);
    // 重写 这个map方法
    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        // 1.获取第一行
        String line = value.toString();
        // 2. 切割
        String[] words = line.split("\t");
        //3.输出
        for (String word : words) {
            k.set(word);
            context.write(k, v);
        }
    }



}